Paper-board machine



Feb. 26, 1935.

L. T. MURPHY PAPER BOARD MACHINE Filed Nov. 30, 1931 5 Sheets-Sheet 1 Feb. 26, 1935. T. MURPHY PAPER BOARD MACHINE Filed Nov. 50, 1931 3 Sheets-Sheet 2 W WM Feb. 26, 1935. L, MURPHY PAPER BOARDMACHINE Filed Nov. 30, 1931 3 Sheets-Sheet 3 Y WM Patented Feb. 26, 1935 UNITED STATES PATENT QFFEQE PAPER-BOARD MACHINE Lloyd T. Murphy, Chattanooga, Tenn.

Application November 30, 1931, Serial No. 578,127

6 Claims.

This invention relates to an improvement in paper-board machines.

In the operation of a machine of this type, difficulty has been encountered in removing water from the paper-board as it leaves the cylinder molds, and the water thus passes to the felts employed, while a substantial part of it remains, however, in the board itself, leaving the board with considerably more moisture and less firmness than is desired.

I have found that a considerable amount of the moisture may be removed from the board and also from the bottom felt by using one or two pairs of squeezing rolls between the cylinder molds and the press rolls. One pair of squeeze rolls may be arranged between the series of cylinder molds and the intake end of the bottom felt, while another pair may be used at the intake end of the bottom felt and between it and the pressrolls so as not only to remove the moisture from thepaper-board by the first-mentioned set, but the moisture and air in the bottom felt and sheet is also removed by the second-mentioned set, which tends also to press out any surplus moisture remaining in the board.

Each of these sets of squeezing-rolls is preferably constructed with a bottom roll of fine wire mesh and a top roll covered with a soft material, such as soft rubber or the like, which squeezes out the water through the wire mesh, and in that way removes it from the paper and the bottom felt. I have found that the use of squeezing rolls of this type is very effective for the purpose and produces substantially improved results.

In the accompanying drawings:

Fig. l is a diagrammatic view of a complete' paper-machine, embodying my improvements;

Fig. 2 is a side elevation of the machine on a larger scale and showing the press end thereof;

Fig. 3 is a similar view showing the cylinder molds;

Fig. 4 is a sideelevation of a pair of squeezingrolls detached;

Fig. 5 is a fragmentary side elevation showing a modification in the use of the squeezing-rolls; and

Fig. 6 is a side elevation of a second set of squeezing rolls detached.

Referring to Figs. 1 and 3 of the drawings, I have designated the usual vats by the numeral 1, in which vats the cylinder molds 2 operate in conjunction with couch-rolls 3. The long wool felt at the top of the machine is designated 4 and operates between the cylinder-molds 2 and the couch-rolls 3, conveying the sheet of paper formed by the cylinder-molds on the bottom run of the top felt 4, which latter is the pick-up felt, forming the plies of paper-board from the cylinder-molds 2 directs the paper-board through a series of pairs of primary press-rolls 5.

The paper-board then continues through a pair of main press-rolls 6, being carried by a bottom felt 7, which passes over one of the main press-rolls 6 at one end and over a guide-roll 8 at its opposite end. Suitable guide-rolls are provided for directing the top and bottom felts 4 and 7. The top felt 4 turns upward after passing under the last of the primary press-rolls 5.

In order to squeeze the water out of the paper after it leaves the cylinder molds 2, I have shown in Figs. 1 and 2 a set of squeezing-rolls between the last of the cylinder-molds and the adjacent end of the bottom felt 7, and which squeezingrolls comprise a bottom roll 9 covered with fine mesh wire, which forms the periphery of the roll, and is carried by suitable supporting-heads at its ends; and, if found desirable, at intermediate points. A top roll 10 cooperates with the wire roll 9, both of which are shown in Fig. 4, the top roll being covered with a soft material which presses against the bottom run of the top felt and the paper-board, so that the paper is squeezed between the rolls 9 and 10, and a sub stantial portion of the water is squeezed out of the felt and the sheet, the water passing through the wire mesh forming the periphery of the roll 9.

A second set of squeezing-rolls, designated 11 and 12, is provided near the end of the bottom felt 7, and between the end of the bottom felt and the series of primary press-rolls 5.

The roll 11 is constructed in a manner similar to the roll 9, having a wire mesh periphery, shown in Fig. 6, and operates on the under side of both the paper and the bottom felt, while the soft upper roll 12 presses against the felt and paper, thus squeezing the water out of the paper and felt. At this point the sheet of paper is between both of the felts 4 and '7, and the rolls 11 and 12 operate on opposite sides of the adjacent-portions of the felts. However, the roll 9 operates against the under side of the sheet of paper, and in direct contact therewith.

After the paper-board passes through the two sets of squeezing-rolls, it is directed between the top and bottom felts 4 and '7 through the primary press-rolls, at the last of which the top felt 4 turns upward, and passes over guide-rolls to the opposite end of the machine, while the bottom felt 7 directs the paper through the main. pressrolls 6.

I have shown in Fig. 5 a modification in the arrangement of the squeeze-rolls wherein both sets of squeeze-rolls operate on the bottom felt '7'.

The guide-roll 8' for the bottom felt is shown as being disposed close to the last cylinder mold, while the first set of squeeze-rolls 9' and 210' are adjacent the roll 8, and these squeeze-rolls have adjacent runs of the top and bottom felts and paper-sheet therebetween, as is also true of the second set of squeeze-rolls 11' and 12', which are arranged adjacent but beyond the first set of squeeze-rolls.

I have found from the use of squeeze-rolls to remove the moisture from the paper before passing it through the press-rolls that a tremendous saving in the cost of the wool felt alone is effected, amounting to a few hundred dollars per month in the operation of a single board machine. At the same time, the machine produces with this improvement a better sheet of board, which is thicker and smoother than that which was produced heretofore, being of the same weight; in other words the board which I am now making will be the same' thickness as we were making heretofore, but each bundle of paper weighing fifty pounds each will have from one to five sheets more therein. This is also a substantial saving which will be realized by the buyer of the paper, who will profit because he will get more boxes out of each bundle of paper than he was able to get with the boards heretofore produced.

I claim:

1. In a paper-board machine, the combination of a series of cylinder molds for forming paperboard, a series of sets of press-rolls arranged to receive the paper-board from the cylinder-molds, a top felt having a. run thereof extending from the cylinder-molds and through the press-rolls and conveying the sheet of paper-board therethrough on the under surface of said top felt, a bottom felt having a run thereof operating through the press-rolls and arranged to contact with the under side of the paper-board on the opposite side thereof from the top felt, a guide roll for the end of the bottom felt adjacent the cylinder-molds, and a pair of squeeze-rolls disposed between the cylinder-molds andthe point of contact of the paper-board with the bottom felt, one of the squeeze-rolls disposed on the nu der side of the paper-board having a wire mesh surface contacting directly with the paper-board.

2. In a paper-board machine, the combination of a series of cylinder molds for forming a sheet of paper-board, a series of sets of press-rolls arranged to receive the paper-board from the cylinder-molds, a top felt having a run thereof extending over the cylinder-molds and through the press-rolls for conveying the formed paper-board therethrough, a bottom felt having a run thereof operating through the press-rolls in contact with the under side of the paper-board, a guide-roll for the end of the bottom felt adjacent the cylinder-molds and a pair of squeezing-rolls arranged between the sets of press-rolls and the guidingroll for the end of the bottom felt, and operating against adjacent runs of the top and bottom felts and the paper-board therebetween, the bottom squeeze-roll having a wire mesh surface and arranged in association with the top squeezing-roll to squeeze water and air out of the paper-board and bottom felt.

3. In a paper-board machine, the combination of a series of cylinder molds for forming paperboard, a series of sets of press-rolls arranged to receive the paper board from the cylinder-molds, a top felt having a run thereof extending from the cylinder-molds and through press-rolls for conveying the sheet of paper-board therethrough, a bottom felt having a run thereof operating through the press-rolls and arranged to contact with the under side of the paper-board, a guide-roll for the end of the bottom felt adjacent the cylinder-molds, a pair of squeeze-rolls disposed between the cylinder-molds and the point of contact of the paper-board with the bottom felt, one of the squeeze-rolls disposed on the under side of the paper-board having a wire mesh surface contacting directly with the paperboard, and a second set of squeeze-rolls arranged between the sets of press-rolls and the guide-roll for the end of the bottom felt and operating on opposite sides against the adjacent runs of the top and bottom felts with the paper-board therebetween for squeezing water and air out of the paper-board and bottom felt, the lower squeezeroll having its periphery formed of wire mesh.

4. In a paper board machine, the combination of a plurality of cylinder molds for forming paper board, a plurality of sets of press-rolls arranged to receive the paper board from the cylinder molds, a felt arranged over the cylinder molds .and having the paper-board on the under surface thereof during passage through the press-rolls, a second felt arranged to underlie the paper board during passage through the press-rolls, a pair of squeeze-rolls arranged between the cylinder molds and the press-rolls on opposite sides of the paper board passing therethrough, and a second set of squeeze rolls arranged between said first-mentioned set of squeeze rolls and the pressrolls and acting on opposite sides of the paper board and felts, the under squeeze roll of each set having a perforated peripheral surface.

5. In a paper-board machine, the combination of cylinder molds for forming paper-board, press-rolls, a pick-up felt extending over the cylinder molds and through the press rolls while having the paper-board on the under surface thereof, a set of squeeze-rolls arranged to act on the opposite sides of the paper-board, the under squeeze-roll having a perforated surface, and being located on the opposite side of the paper board from the pick-up felt, a bottom felt extending under the paper-board during passage through the press-rolls, and a second set of squeeze-rolls arranged to act on opposite sides of the felts and paper-board, the lowermost of the second set of squeeze-rolls having a perforated surface.

6. In a paper-board machine, the combination with a cylinder vat unit, a pick-up felt operating over the vat unit and arranged to collect a paper web on the under surface thereof, a press arranged in a generally horizontal direction from the vat unit and through which the pick-up felt passes while carrying the paper web on the under surface thereof, a bottom felt having a run thereof operating through the press in contact with the under side of the paper web, and a pair of coacting squeeze-rolls arranged between the press and the vat unit and operating against adjacent runs of the pick-up and bottom felts- LLOYD T. MURPHY. 

